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Psychology
MEDIUM
ENGLISH
Psychology
A friend states that since he has been taking vitamin C, he has not had a single cold. His observation has little value in assessing the effects of vitamin C because:
there was no control group for comparison
Correct answer
B
he has not calculated a correlation coefficient
Option B
C
of the effect of the observer on the observed
Option C
D
he does not specify his dosage of vitamin
Option D
Correct answer: A
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